Duplicating machine



March 21, 1961 E. M. SPRlNGER DUPLICATING MACHINE 9 Sheets-Sheet 1 FiledMay 24, 1957 INVENTOR. EDWARD M. SPRINGER March 21, 1961 E. M. SPRINGERDUPLICATING MACHINE 9 Sheets-Sheet 2 Filed May 24, 1957 INVENTOR EDWARDM. SPRINGER BY March 1961 E. M. SPRINGER 2,975,707

DUPLICATING MACHINE Filed May 24, 1957 9 Sheets-Sheet 5 NQ m3 wwv L TINVENTQR. EDWARD M. SPRINGER BYWI 9 Sheets-Sheet 4 Filed May 24, 1957INVENTOR.

EDWARD M. SPRmeER March 21, sp l G 2,975,707

DUPLICATING MACHINE Filed May 24, 1957 9 Sheets-Sheet 5 INVENTOR. EDWARDM. SPRmGER M, 49M, 34,00

March 21, 19 1 E. M. SPRINGER 2,975,707

DUPLICATING MACHINE Filed May 24, 1957 9 Sheets-Sheet 6 INVENTOR.

EDWARD M. SPmNeER BY I 0 M,

March 21, 1961 E. M. SPRINGER 2,975,707

DUPLICATING MACHINE Filed May 24, 1957 9 Sheets-Sheet 7 INVENTOR. ED ARDM. SPRINGER I 49 ML March 1961 E. M. SPRINGER 2,975,707

DUPLICATING MACHINE Filed May 24, 1957 9 Sheets-Sheet 8 F g J 7 '7 2&9

INVENTOR. EDWARD M. SPRINGER BY flu uh, MA/ FGI'W March 21, 1961 E, RINER 2,975,707

v DUPLICATING MACHINE Filed May 24, 1957 9 Sheets-Sheet 9 INVENTOR.

EDWARD M. SPRINGER m, 0m,

United States Patent ice 2,975,707 DUPLICATING MACHINE Edward M.Springer, Chicago, Ill., assignor, by mesne assignn'len'ts, to HeyerIncChicago, Ill., a corporation of New York 7 Filed May 24, 1957, Ser. No.661,460

25 Claims. (Cl. 101-232) The present invention relates to a duplicatingmachine, and more particularly to an automatic duplicating machine.

More specifically stated, the machine forming the subject matter of theinvention is power driven, by means such as an electric motor, and isshut off pursuant to the passage through the machine of the last of astack of copy sheets placed in the machine for receiving impressions inthe duplicating process.

A broad object-of the invention is to providea duplicating machinehaving novel means for automatically shutting it oil in the mannerstated.

Another object is to provide aduplicating machine and means forautomatically shutting it off, in which the shut-oil means is controlledby the copy sheets placed in the machine and is sensitive to the copysheets including the last of the stack of suchcopy sheets which,

while it is in place on the tray for normally supporting A it, retainsthe control means in a first position; and when it leavesthe tray andpasses through the'machine,

it enables the control means to drop through a great distance, w'herebyto provide highly accurate control in the shutting off operation.

Another object is to provide, in an electrically driven machine, meansfor shutting oif the machine, which includes electromagnetic means thatis momentarily energized for performing the shutting off and stoppingfunctions, and mechanical latchingmeans for thereafter holding themachineintshut-off condition, whereby the electro# magnetic means mayBede-energized, so that the elec'tiic current supplied to themachineneed not be continued after the machine has been shut off.

Afurther object is to provide a machine driven by an electric motor, andautomatic'means' for shutting it off, in which the" electric motor isde-activated in the operation of shutting off the machine,- whereby toeliminate the necessity for clutch means between the electric motor andthe parts driven thereby.

Another object is'to provide a duplicating'machine and means forshutting it oif including a brake shoe engageable with a relativelyhigh-speed rotating par-t, whereby to accurately control the stoppingposition of the slower moving parts connected in driving relationtherewith.

Still anotherobject is to provide a duplicating machine of the characterjust stated in which, because the brake shoe engages the relativelyhigh-speed part, the moving parts may be permitted a certain degree ofoverrun in stopping, with consequent reductionin shock as when stoppedabruptly, while nevertheless enabling" stopping the parts accurately iiipredetermined position.

v A still further object is to provide a duplicating machine driven bypower means,.such as an electric motor, and means forautomaticallyshutting off and stopping the machine including" a brakeshoe normally held in braking position when the driving means isde=activated and the machine is shut off, in which the brake shoe can bereleased, bya simple manual manipulation, whereby the machine" caneasily bemanipulatedmanually as may 2,975,7e7 Patented Mar. 21, 1961 2be desired fol-repositioning certain parts, and the machine can beprovided with a crank for operating it in the event of a power failure;

Still another object is to provide a duplicating machine With means forautomatically shutting it oil pursuant to the last of a stack of copysheets passing through the machine, as referred toabove, and novel meansfor effecting a time delay action So that after the last sheet leavesthe supporting tray, the machine will continue a cycle of operation thatwill enable it to pass entirely through the machine.

A further object is to provide a duplicating machine through which copysheets pass in a duplicating operation, and the mahcine makes one cyclefor each copy sheet, in which the machine may be adjusted to providecycles to accommodate copy sheets of difierent lengths.

Another and more specific object is to provide a duplicating machinehaving a rotating drum carrying a master for forming impressions on copysheets fed successively through the machine from a stack placed on asupporting tray, in which means is provided for automatically shuttingoff the machine pursuant to the last sheet from the stack passingtherethrough, and turther in which time delay means is provided forenabling the last sheet to passentirely through before the machine isshut ofi,

.wherein novel means is provided for making adjustment for cycling themachine to accommodate copy sheets of difierent lengths, such forexample as 11" and 14 sheets which are commonly used lengths.

A- further object is to provide a duplicating machine with means forautomatically shutting it oif pursuant to the last of a stack of copysheets passing therethrough, as referred to above, in which means isprovided for alternatively conditioning the machine to operate'throughonly asingle cycle at each operation.

Other objects and advantages of the invention will appear from thefollowing'detail description taken in conjunction with the accompanyingdrawings in which:

Figure 1 is a perspective view of a duplicating machine made accordingto the present invention, the view being at an angle from the right,front;

Fig. 2 is aperspective view of the duplicating machine from the-oppositecorner relative to Fig. 1, or the left, rear;

Fig. 3 is a perspective view oriented according to Fig. 1, with thetrays for the cop'ysheets removed;

Fig. 4 is a plan view of the machine with the side casmg members removedand certain other elements elimi nated;

Fig. 5 is a front elevational view of the machine with the side casingmembers and certain other elements removed from the machine;

Fig. 6 is a vertical fore-and-aft sectional view taken approximately onthe line 6-6 of Fig; 4, but showing portions of the trays for the copysheets in place:

Fig. 7 is a side elevational view of the machine taken from the rightside thereof, with the respective side casing member removed, this viewbeing taken approximately on line 7-7 of Fig. 4;

I Fig. 8 is a side elevational view'from the left side of the machine,with the respective side casingmember removed, the view being takenapproximately on. the line 8'-8 of Fig. 4; 4

Fig. 8A is a detail view of a portion of the latching means andassociated elements shown at the right-hand end of Fig. 8, showing thelatching means in latching Fig. 11 is a detail view of another elementutilized in the assembly of Fig. 9;

Fig. 12 is a sectional view showing brake means and certain otherelements as viewed at line 1212 of 'Fig. 4;

Fig. 13 is a view of certain operating linkage shown in Fig. 8, thelinkage being for the most part isolated from its surroundings;

Fig. 14 is a large scale view of certain details at the right-handportion of Fig. 13;

Fig. 15 is a large scale view of certain details, also of the right-handportion of Fig. 13;

Fig. 16 is a view similar to Fig. 13, but with certain elements in analternate position;

Fig. 16A is a fragmentary perspective view showing certain elements ofthe machine constituting a modified form of the trip means;

Fig. 17 is a detail view of certain elements shown at curved line 1717of Fig. 7;

Fig. 18 is a detail view of certain elements shown at the left-hand endof Fig. 7, isolated from surrounding elements;

Fig. 19 is a view similar to Fig. 18, but with certain of the elementsin a different position;

Fig. 20 is a view similar to Figs. 18 and 19, but with the elements instill a different relative position;

Fig. 21 is a view similar to Figs. 18 to 20, but with the elements in adifferent relative position;

Fig. 22 is also a view similar to Figs. 18 to 21 showing the elements instill a different relative position; and

Fig. 23 is a diagrammatic view showing the electric circuit employed andcertain other elements associated with the circuit.

Referring now in detail to the drawings, a duplicating machine madeaccording to the present invention is shown in its entirety in Figs. 1and 2, and is shown in Fig. 3 with the trays for the copy sheetsremoved.

In thefollowing description of the structural details of the duplicatingmachine reference is made to prior copending applications disclosing andclaiming certain subject matter in common with the present machine andreference is made to those applications for the purpose of minimizingherein detailed description of those portions of the structure of thepresent machine that are also included in the prior applications.mentioned are Serial No. 420,232, filed April 1, 1954, now Patent No.2,830,534, in the name of the present inventor and Francis K. Moore, andSerial No. 623,492, filed November 20, 1956, in the name of the presentinventor. For the purpose of facilitating reference to the machine, andthe parts thereof, the view of Fig. 1 may be considered as taken at anangle from the right, front, the machine having a front end 12, a rearend 14, a right side 16 and a left side 18. The general operation of themachine, as will be understood, is that a stack of copy sheets 20 areplaced on a tray 22 at the front end of the machine and are fed throughthe machine and after the duplicating process has been performed, theyemerge from the machine, at the rear and are stacked on a tray 24 atthat end.

Attention is directed particularly to Figs. 4, and 6 for the main framestructure and the principal partsof the machine that are common with theduplicating machine of the above-mentioned copending applications. Themachine includes a frame structure which consists essentially of a base26 and upstanding side plates 28 and. 30 at the right and left handsides, respectively, of the machine. The side plates 28 and 30 supportcertain main operating parts of the machine between them, and otherparts such as drive elements and certain control elements on theexterior surfaces thereof. The plates are provided, in the finishedmachine, with side casing members 32 and 34, respectively, to enclosecertain of the parts mounted on the exterior of the side plates, toprovide a finished appearance, as will be understood. These side casingmembers 32 and 34 are omitted fromiFigs. 4 and;

The two applications,

5, as well as other figures, to expose the normally enclosed elements toview.

Referring now to Figs. 4, 5 and 6, a rotatable drum 36 is mounted on andbetween the side plates, adjacent the top thereof and thus adjacent thetop of the machine, and has a clamp bar 38 for clamping the leading edgeof a master to be carried by the drum. In Fig. 6 the drum 36 is shown inposition with the clamp bar 38 adjacent the top, but as will be broughtout in detail hereinafter, the drum will at times stop at a positionwith the clamp bar 38 in an alternate position, namely, adjacent thatshown in dot-dash lines displaced angularly from the full line positionand removed from the top of the machine. Cooperating with the drum 36 isan impression roll 40 arranged for biasing movement toward the drum forgripping or firmly engaging a copy sheet 20 passing through the machinein the duplicating process, this sheet passing between the drum and theimpression roll. The impression roll 40 is not a driven roll, but itrotates in response to its engagement with the copy sheet passingbetween itself and the drum 36. The copy sheets 20 are fed to the drum36 and impression roll 40 by a pair of rolls including a moistening roll42 and a presser roll 44. The moistening roll 42 is a driven roll, beingdriven by means to be described hereinbelow, while the roll 44 is anidler roll, being rotated by its engagement with the copy sheet passingbetween that roll and the moistening roll 42.

The impression roll 40 and presser roll 44 are mounted in hangers 46which are arranged to pivot about eccentric axes on supporting elementssuch as studs 48. A tensioning device 50 is utilized for regulating thepressure exerted by the rolls 40 and 44 on the respective counterpartelements. The mounting for these rolls and the tensioning device arefully described in the above-mentioned co-pending applications. t

The moistening roll 42 is coated with a fluid by means of a wick bearingon the roll and extending into a transverse trough (not shown) supportedby the side plates.

The fluid is provided to the trough by means of a fluid tank 56 which ismounted on and extends between the side plates 28 and 30 and isrotatable between two positions for alternately supplying fluid to thetrough and removing the tank from feeding relation with the trough. Thetank may be rotated by a suitable handle and grip 54 (Fig. 5). Thetrough has a receptacle 58 (Figs. 4, 5, and 7) extending to the exteriorof the associated side plate 28 and the tank 56 is provided with valvemeans 60 for controlling the flow of fluid from the tank to thereceptacle 58. The tank is movable to an inoperative position as shownin Fig. 7 in which the valve means 60 is removed from the receptacle 58and is closed, and to an operative position in which the valve meansextends into the receptacle 58 and is opened. The tank and related meansfor feeding fluid to the moistening roll 42 are fully described in thefirst of the two above-mentioned applications and need not be describedfurther in detail herein. It will be noted from Figs. 5, 6, and 7 thatthe tank 56 is mounted adjacent the top of the side plates 28 and 30 andit is also closely adjacent the drum 36, as will be understood from thedesired compact arrangement of the elements, to minimize the over-alldimensions of the machine. As mentioned above, the drum 36 in certaininstances will stop at inbelow.

In Fig. 6 the tray 22 at the front end of the machine on which the copysheets are placed, is shown. This machine;

5. tray. is preferablyremovable and for the most part is shown in detailin the above-mentioned applications; It includes adeckelement62, a frontdownturned flange 64 and side downturned flanges 66. The tray issupported in position by means of pins 68 onafixed element in themachine, projected through holes in the front flange 64, and clips 70onthe side plates providing upwa'rdly facing openings for receiving theside flanges 66; The tray may be removed by lifting vup' on theouter endto release the side flanges-66 from the clips-'70 and then withdrawingforwardly on the tray to release the front flange 64 from the pins68. 7

The student copy sheets 20 is placed on the tray and fed from. thestacleby f at 'ndicated in its entirety at 77; and deserrbe'd I L At thepresent point snffiee it tofl-say that that feed means includes feedwheels 7 4 which'are rotated at the appropriate portion of the cycle ofoperation for feeding the sheets from the tray. These feed wheels arepreferably of rubber or rubber-like material and engage the topmostsheet of the stack when the feed means 72- is restinglthereon, as isdone in the operation of the machine, being gravity actuated.Upon'rotation of the feed wheels 74 the uppermost sheet from the stackis forced rearwardly (to the right, Fig. 6) and engages one or anotherof inclined baffles 76 which deflects theleading edge of the sheetthrough the passage 78 therebetween and into engagement with the rolls42 and 44. Feeding of the sheet fromthat point on in the cycleofoperation is believed obvious, and is explained in detail in theabove-mentioned applications. Upon the duplicating process beingcompleted, and the sheets leaving the drum 36 they are deposited on thetray 24, a stacking device 80 of conventional nature being employed toaid in the stacking. I i H The deck element 62 of the tray 22- isprovided-with depressions 82 (Fig. 6'), one for each of the feed wheels74. These depressions are of minimum dimensions rel, ative to the feedwheels, namely, they are arcuate in one direction with a radiussubstantially equalto that of the wheels, and of a width only slightlygreater than the Width of the wheels. In the ope-ration of the devicethe copy sheets 20 on the tray support the feed means 72 and thissupport is provided even by the last single copy sheet remaining on thetray, the dimensions of the depressions 82 being no greater thannecessary to accomplish this purpose. In Fig. 6 is shown a single copysheet 20 remaining on the tray, and supporting the feed means 72.- Uponthis last c'opy sheet 20 leaving the tray, and passing through themachine, the feed wheels 74 drop into the depressions S2 and by reasonof the movement effected by this drop certain control functions areperformed for stopping the machine. These functions will be brought outin detail hereinbelow. U

The details of the structure of the feed means72- are best seen in Figs.1, 3, 5, 6, 7, and 8; The feed means 72 includes a rotatable shaft 84 onwhich the feed wheels 74 are mounted for rotation therewith, the shaftbeing supported by arms 86 and 88 on the right andleft-hand sides,respectively, of the machine (see Figs. 7 and 8). The feed means alsoincludes a bar 90 above the shaft 84 and mounted in the side arms '86and 883 and forming with the shaft and arms a relatively rigid devicethat may be grasped by the hand for manipulating it. This assemblagewith the side arms 86 and 88 making up the feed means 72 is swingableabout the axis of the studs 92 and 94 on which the arms are pivoted,being urged downwardly by gravity and thus arranged to follow the stackof copy sheets 20 and thereby forming a sensing device for controllingthe means for automatically shutting off the machine when the stack ofcopy sheets is depleted, and the last one has passed through the Thestuds 92 and 94 are suitably mounted in the respective side plates oftheframe. Preferably a s ringsuch as the hairpin spring 96 (Fig. 7) isarranged f i sin w rdly on he a m 86 and thus on flic e means to:minimize or take up the'play in the rack. The side plates 28 and- 36are'providedwith arcuate slots 98 (Fig. 7) and 100, (Fig. 6'),respectively, for receiving the shaft 84 and bar 90 of the. rack. 'Ifdesired the slots 9Sand100 may be dimensioned for serving as a limitstop for defining the extent to which the feed device 72 may lower, butit is also within the scope of the invention to provide that thedownward movement ofthe feeddevice is limited by the floor of thedepressions 82 (Fig; 6) when engaged by the feed wheels 74. The drop ofthe feed wheels 74 from the last eopy sheet 20 over the depressions-,-into the depressions, is relatively great and therefore considerablelatitude isprovided whereby the slots- 98 and 100 may benreli edgonfordefining the lower limit to which the feed device 72; may moveand stillefficiently perform thegshutting: off function.

The drive for the duplicating'machine is-rderived from a suitable sourcesuch as an electric motor 102 (Figs. 5 and 6) mounted at aconvenientlocation and preferably adjacent the front. It is partiallyenclosed by a cover or shield 104 (Figs; 3 and 6) which is generallyL-shaped having a vertical leg orpanel 106 at the front and a tophorizontal leg'or panel 108. The motor 102 may be of any desired typeand is providedwith a drive shaft 110 which is connected by, means of asuitable coupler 112 with another shaft 114 which extends through anopening 116 (Fig. 7)v to the exterior where a drive pulley 118 ismounted thereon. The coupler 112 serves as a permanent connectionbetween the drive shaft 110 and the shaft 114, and it is pointed outthat the machine made according to the present invention does notrequire a clutch between the motor and the parts driven thereby; thereis no disconnection in the drive in the operation of stopping themachine. In stopping the machine, the rotor of the motor 102 remainsconnected with the shaftslll-d and 114 and is stopped in the sameoperation of stopping the remaining driven parts of the machine. A belt120 (Fig. 7) is trained over the pulley 118 and another and largerpulley 122 mounted for rotation by suitable means on the side plate 28as by a stud 124. Provided on or connected to the large pulley 122 is asmall pulley 126 over which a belt 128 is trained, this belt also beingtrained over another pulley 130 mounted on the shaft 132 on which thedrum 36 (Fig. 6) is mounted. It will be seen that the arrangement andrelative dimensions of the pulleys referred to establishv a greatlyreduced speed drive between the shaft '114 and the drum. Mounted on theouter end of the drum shaft 132, on the right-hand side, is a hand wheel134 (Figs. 1, 3, and 5). The 'drum 36 is mounted on the shaft 132 foradjustment angularly with respect to the shaft, which is done by meansof thumb wheels 136 (Figs. 1 and 3) in the manner described in the firstof the above-mentioned co-pending applications. The wheel 134' in thepresent case replaces the crank utilized in the abovementionedapplications in view of the fact that the present device is power drivenand automatically controlled. However, it may be that the user willdesire to adjust the drum 36 manually, for a purpose referred to below,and in that event he may merely grip the wheel 134 and turn it.Consequently, the wheel 134 is of substantial size to facilitategrasping it and turning the drum. It is within the compass of thepresent invention to provide a handle or crank means on the wheel 134 tooperate the machine manually, if such should be desired as in the caseofpower failure. Notwithstanding the automatic control of themachine, themachine can b readily adapted to manual operation.

The means for feeding the copy sheets from the tray 22 through themachine is driven by the drum 36, or more particularly the shaft 132.The'speci'fic drive utilized for the feeding means is substantially thesame as that disclosed in the. second of the above mentioned 00-,

pending applications and hence reference thereto in the present instancewill be minimized. Attention is directed particularly to Figs. 4 and 8in which the drum shaft 132 is projected through the left-hand sideplate 30, and on the end of the shaft outwardly of the side plate aremounted a pair of timing discs 138 and 140 and a gear 142 arranged in arigid assembly for rotation in unison with the shaft 132. The gear 142is in mesh with a gear 144 forming one of a pair of gears fixed forconjoint rotation, the other of which 146 is coaxial therewith and inmesh with a gear 148 included in a compound clutch means 150. Thisclutch means includes control elements controlled respectively by thetiming discs 138 and 140 in certain predetermined relation with respectto a cycle of operation of the machine. Drive is established from theclutch means 150 to the shaft 84 through a series of gears 152, 154,156, and 158. The first of these gears, namely, 152, is mounted on thestud 94 on which the arm 88 is mounted (Fig. 8) and the gears 154 and146 are mounted on the arm 88 and movable therewith, while the gear 158is mounted on the shaft 84, and, of course, on the arm 88 for movementtherewith. The clutch means 150 and gear 148 are mounted on a shaft orstud 160 coaxial with the shaft on which the moistening roll 42 (Fig. 6)is mounted, and upon rotation of a certain element of the clutch means150, rotation of the roll 42 is accomplished.

It might be stated also that the feed wheels 74 and moistening roll 42are freewheeling, i.e., each is operative for feeding the copy sheetsthe necessary extent for engagement by the next succeeding feedingdevice. For example the feed wheels 74 rotate through such portion of acycle of operation as is necessary to feed a copy sheet from the stackon the tray 22 to the moistening roll 42 and presser roll 44. Thereafterdrive to the feed wheels 74 ceases and the copy sheet on being drawnthrough the machine turns the feed wheels 74, the structure including anoverrunning clutch to effect such opera tion. Similarly, the'moisteningroll 42 is rotated after the leading edge of the copy sheet engages it,sufiicient to move the copy sheet therepast and the leading edge of itinto engagement with the drum 36. Thereafter the driving means to themoistening roll 42 ceases and the roll then becomes freewheeling, aclutch means being provided to accomplish that purpose, and rotates inresponse to the copy sheet being drawn therepast. The copy sheet isfinally fed out of the machine and onto the tray 24 by the drum 36 inconjunction with the impression roll 40.

Other elements shown in Fig. 8 and not entering into the presentinvention, but which are described in one or both of the above-mentionedco-pending applications include a counter 162, a mounting bracket 164for the tank 56, latch means 166 for controlling the clutch means 150,and a pulley 168 mounted on a shaft for controlling the tensioning means50 (Fig. 6), the pulley being associated with a flexible cord 170, theends of which are secured to a bar 172 mounted for swinging movement andhaving a handle 174 (Figs. 3 and 6) extending through a slot 176 in theassociated side plate 30 for convenient access to the operator.

Attention is next directed to a unit or assemblage indicated in itsentirety at 178 shown at the lower right-hand corner of each of Figs. 4and and shown in greater detail in Figs. 9 to 12. This unit orassemblage is a switching-braking-latching device or structure and con-'sti tutes one of the main subassemblies or portions of the automaticdrive and control of the machine. This unit or assemblage is associatedwith the shaft 114 for performing a braking operation on that shaft. Thebraking operation is accomplished by a solenoid and the same solenoid isincorporated in relay means which includes an operating switch (orbrake-stop switch) indicated at 180 which may be a conventional switch,preferably a microswitch. This switch is a simple on-off switch (seealso Fig. 23) and is mounted in any convenient location such as on thebase 26 of the framework. The switch has a control arm 182 arranged formovement in a horizontal plane and is self-biased to closed position, orthe full line position of Fig. 23. This position is also that shown indotted lines in Fig. 4, and that when moved toward the observer asviewed in Fig. 5. The switch is open when in the opposite position,namely, the full line position of Fig. 4 and moved away from theobserver in Fig. 5. The switch is moved to open position by a solenoidto be described hereinbelow. The unit or assemblage 178 includes a framestructure 184 which includes side plates 186 spaced apart along theshaft 114 and provided with suita le bearing means 188 to support theshaft. The side plates 186 have lower turned over portions 190 securedto the base 26 and are interconnected at one or more places by suitableties such as a rod 192. The frame structure including the side platesand tie 192 thus provide a rigid structure for supporting the brake shoeand latch means as well as other elements to be described hereinbelow.

The shaft 114 is provided with a brake drum 194 disposed between theside plates 186, in the form of a collar or large diameter ring on theshaft. The unit or assemblage 178 includes a brake shoe 196 for brakingengagement with the brake drum 194 on the shaft (see particularly Figs.5, 9, and 12). The brake shoe 196 may be of conventional form, having anasbestos type brake lining engaging the drum 194, and being mounted on ahanger 198. The hanger 198 may be generally U-shape, having side arms orflanges 200 and an inter connecting web 202. The specific mounting forthe brake shoe may take the form of a pin 204 secured to the brake shoeand slidably mounted in a hole in the web 202, a compression spring 206being interposed between the shoe and web for biasing the shoe away fromthe web and in the direction of the brake drum 194. Upon application ofthe brake, the compression spring 206 yields against the force of movingthe hanger 198 in brake applying direction in the usual manner. Thehanger 198 is pivotally mounted on the tie rod 192, at the upper end ofthe hanger, and the lower end of the hanger is connected by means of across pin 208 to a link 210 (Fig. 9) which in turn is connected to thearmature 212 of a solenoid 214. The solenoid is mounted on the base 26at a convenient location and upon energization of the solenoid thearmature 212 is retracted (moved to the right, Fig. 9), whichconsequently swings the lower end of the hanger 198 to the right orcounterclockwise (Figs. 9 and 12), bringing the brake shoe 196 intobraking engagement with the brake drum 194.

This same operation in applying the brake also actuates the switch 180,and specifically moves the switch to open position, swinging the controlarm 182 thereof in counterclockwise direction (Fig. 4) or away from theobserver (Fig. 5). This actuation of the switch control arm 182 isaccomplished through the medium of a switch trip arm 216 located asshown in Figs. 4 and 5 and shown in detail in Fig. 11. This arm ispivoted on the tie rod 192, and hence is coaxial with the brake hanger198, having an aperture 218 for so pivotally mounting it. The arm alsohas a notch 220 for receiving a pin or stud 222 mounted on the brakehanger 198 (Figs. 5 and 12). A tension spring 224 is interconnectedbetween the lower end of this arm and a fixed element such as a bracket226 (Figs. 5 and 9) mounted on the base 26. The spring 224 biases thearm 216 clockwise (Fig. 9) or toward the observer (Fig. 5) or in otherwords in direction to enable the switch control arm 182 to assume itsclosed position. The switch trip arm 216 is moved in the oppositedirection, or in direction to trip the switch control arm 182,

by the brake hanger 198, as stated, and it is accomplished specificallythrough the pin or stud 222, i.e., upon movement of the brake and thehanger 198 in brake applying 9f direction-,1 the switch trip; arm 216:is moved therebyzin direction for tripping the switch control arm; 1 82.

Latchingrneans are providedf'for. latching the brake 'in brakingposition and latching the switch 180 ;in' openposition, both positionsbeing-: such as moved by the solenoid. This latching means-is in theform ofa pair of identically shaped'armsorele-ments 228 and 230,1catedaas indicated in-Figs; 4 and 5 and shown in detail in Fig. 10. Eachelement includes aypin or stud 232 by which it is pivotally mounted onthe respectiveside plate? 186; The armahas a lower horizontal extension234havingnotches236 and 238"the'rein' as well as anupstandingprojection-240* serving a stop means outwardly of the notches;as willbe" brought out in detail hereinbelow, and" finally anaaperture242 adjacent the outer end or toe 2'43'0f the lower portion. The arm orelement alsoincludes tan-upstanding: portion 244 at the top of which isan. arcuate slotw246 for receiving; a pin 248. (Fig. 9') mbuntedintheirespeet-ive sideplate 18.6 for guiding the arm 228 in itslatchingiand unlatchingrmovei merits. At the upper end'of: the: verticalportion 244-'isa' horizontal extension: 250 having: an upstandingextremity defining a surface: 252 for engagement by a bar 254(=Figs'.5'and9') in the'unlatching'operation; A tension spring 255 isinterconnected: between? the toe 24 3, as in the: aperture 242, and a:fixed portion such as the tierod' '192 fr biasing. the" arm in' latchingdirection which is clockwise direction astvi'ewe'd in Figs. 9 and 10.

As mentioned above, the; latching elements or arms- 228" and 230 areutilized for'latching thebrake' in applied or braking: position and theswitch 130'in open'pos'ition' pursuant to those elements beingmov'ed totheir respecttive positions by the solenoid 214.- Referring first? tothe' means for latching the brake}: attention is directed to Figs. 4 5and 9whichshoW a pin- 256 on the brake hanger 198 adjacent the lower'endo'fthe latter, extend ing to the right (Figs. 4 and 5) into engagingrelation with the associated latch element-orplate228t This pin or studis positioned for engaging in' one or the other of thenotches 236, 238(Figs; 9; 10,- and 12"). When the brake is in applied or' brakingposition the pin' 256 is received in the notch 236 (Fig; 12) but whenthe brak'e'is' in released or n'on brakin'g" position,-name1-y, that ofFig. 9, the pin 256 is received in the'n'oteh 2381 The tension spring255 serves to bias the latching element orarm 228 in clockwise directionto'retain the pin 256 in the respective notch 236 or 2 38 The upstandingprojectio'n 249'ser'v'es to prevent the brake hanger 198 fromswingingtoo far in clock-wise diie'ction'or' b'r-ak'e releasing re t Thelatching operat ior'i forlatching-the switch 18min open position issimilar t'o tha-t described above in con-' nection with thelatchingoperation with respect" to' the brake. The stud 222 on the brake hanger198 extends lat'erally'there'from and into enga ement in: the notch 2 20in the switch trip rm (Figs. 11 and 1 2 brake being m'oved t'o brakingposition (counterclockwise, Figs. 9 and 12) the pi'n or stud 222engaging in the notch 220'moves the switciitrip'arm 216 inthe samedirection. The switch trip arm 216 is provided adjacent its lower endwith a pin or stud 25 8 extending laterally into engaging relation withthe associated' latching element or arm 230 (to the left as viewed inFigs; 4 and 5). This pin or stud 2158 is aura'nged for entering into thenotches 236, 238 (Fig. 12) in the associated latch arm 230 precisely inthe same manner as described'above in connection with the latching ofthe brake. The latch element or arm 230 is biased in latching direction(clockwise, Fig. 9) by the associated tension spring 255.

In the shutting on and stopping operation, it is assumed that the brakeis reposing innon-braking position (Fig. 9) and the switch 180' isclosed, or released by the switch trip arm 216; with the elements insuch condition, the solenoid 214 (Fig. 9) is causeti to'be ener giz'ed,which draws on the brake hanger 198' and moves Upon the the la e '0 raina m it on (R s 12); h mo me 9' r k h EfiT'rJH Q Ehe pin 222 engagingin the notch .220,- dr-aws=,-t he switch trip arm 216- in the samedirection; the-switch trip;,ar1nengages the switch controlarm 182andmoves it in similar direction-to switch-open position. The brake hangerand switch trip arm-are then latched'by thelatch-elemcnts or arms 228, 230;. in the'manner described above. The latch elements ,or arms 228, 230are unlatchecl, in the normal functioning of the machine through themedium of the bar 254*Which is mounted on and actuated by a starter armorcontrol lever indicated in its entirety; at 260 and described indetail hereinbelow in connectionzwith the next phase of the operation ofthe machine. The starterarmis provided with a push button 262 which isexposed to the exterior as shown in Figs. 1- and 3 forfleasyaccess bythe operator. Suihce it to say at the present point; that upondepression of the push button 262; the starter arm 260' is-rotated inclockw-i's'e direction (Fig;7-)-which movesthe bar 254 to theleftas'viewed in Fig. 9 orvtoward the-observer as viewed in Fig. 5.-This barithen engages the surfaces 252 of the latch-.elements or arms228, 230 and rocks the latter in counterclockwise direction? (Fig 9)which lowers the lowermost horizontal arm portions 234 and releases thepins 256, 2'58 from the respective'notches 236. The tension" spring:2241 (Figs- 5' and- 9) moves the trip switch ar'rn:216:-in*-releasingdirection-( to'the-left, Fig. 9, toward theobserv'er, Fig". 5').- Theswitch trip arm 216 through themediurrr of thepint 222 which engages inthe notch 220 moves the/brake hanger 198" in" the same'direction,natnly,.in the=' non-braking or releasing direction. The starter armOIZPLlSh button 262' is" actuated normally only momentarily, and thenreleased. This momentary 'actuat'ion i'ssufiicient to enable the b'rakehanger and switch trip arm-to bemo'ved inreleasing direction, afterwhich and pursuant to"release-of the pushbutton 262 the latch elementsor arms 228; 260 aredra-wn upwardly by the respective tension springs255 so that the pins 256 and 258-become engaged in therespective notches238;

The' above operation iin which the latching means for both the brake andthe switbhare released is normally th'at' accomplished in the usualoperation of the machine in' which the machine is put into operationafter having been previously automatically stopped, as explained indetail hereinbelow. Inother words, the-brake remains in' brakingposition and the switch 180 in open position while themachine is atrest, but when boththe brake and switch latching meansare moved toreleased position it is'intended that the machine be 'put intooperation; However, it is desired at times that' the brake means hereleased without releasing the latching means for the switch. This isaccomplished through a manual control means indicated "in its entiretyat 264 in Fig; 9. This latch means includes a push button 266 exposedthrough the frontpane1 106- (Fig. 3) of the shield 104; This latch meansmay be of any suitable construction and includes a bottom-horizontallyextending trip element 268 positioned for engaging theme 243 of thelowermost extremity of the: latch arm"228 for the brake (Figs. 4' and9)". Thepush-but-tor'i-may include an'element 270 verti callyslida'bl'e' in mounts 272' fixed to' the panel 106. A tension spring 274'is" interconnected between the upper mount 272 and the-trip element268; normally retaining the'push'button 266 in raised position but upondepression of the button, as" by engaging itwiththe thumb (Fig. 3) andmoving it downwardly, the element 268engages the toe'243 and moves thelatch arm in counterclockwise or releasing direction"(Fig. 9). The brakemeans is thus released, but the arrangement between the pin 222 and slot220' is such as to enable movement of the brake hanger relative to theswitch trip arm which remains in latchedpositio'n. The brake hangerreadily moves in clockwise or releasing directionin this unlat'chingoper ation due to gravity,- as will be readily observed in Figs.

11 9 and 12, but if desired spring means for this purpose may beutilized. In a later operation of starting the machine when the pushbutton 262 on the control lever 260 is depressed, the bar 254 merelyperforms the unlatching operation on the latch element 230 for theswitch. I

The operating sequence of the braking and latching functions will bereferred to again hereinbelow in connection with other functions of themachine in the general operation.

Attention is next directed to the starter arm. or control lever 260referred to above and other parts directly related thereto. Attentionfor this purpose is directed particularly to Figs. 5, 7, and 17 to 22inclusive. The starter arm is disposed at the right side of the machineadjacent the front, with the push button 262 exposed to the exterior atthe right front, as mentioned above, and as shown clearly in Figs. 1 and3. This starter arm performs certain operating functions in connectionwith the feed device 72 through the medium of the arm 86 (Fig. 7), andwith a start switch 276. The starter arm 260 includes an arm or leverproper 278 which may be generally plate-like in form and is pivotedintermediate its ends on a pin or stud 280 mounted on the adjacent sideplate 28. Adjacent the lower end of the lever or arm 278 is a slot 282guidingly receiving a pin 284 fixed on the side plate 28. The starterarm 260 is biased in counterclockwise direction (Fig. 7) to an outerposition by suitable means such as a wire spring 286 having a centralportion coiled on the pin 280 and its ends engaging the push button 262and the pin 284, respectively. On the lever or arm 27 8 adjacent thelower end of the latter is another stud 288 positioned for engaging thecontrol arm 290 of the switch 276. Also adjacent the lower end of thearm 278 and fixed thereon is another pin 292 (see particularly Figs. 17to 22, inclusive) which preferably has a roller thereon and which isdisposed for certain engaging cooperation with an extension 294 of thearm 86, the details of which are brought out hereinbelow. The bar 254,referred to above, is secured to the lower end of the arm 278, andextends through the opening 116 (Fig. 7) of the side plate 28.

Upon actuation of the starter arm or control lever 260 as by depressionof the push button 262 and consequent rotation thereof in clockwisedirection, (Fig. 7), the pin or stud 288 engages the switch control arm290 of the swtich 276 and swings the latter in counterclockwisedirection. This switch is indicated diagrammatically in Fig. 23 and isnormally biased to a first position shown in full lines in Fig. 23 andwith the switch control arm 290 (Fig. 7) moved in clockwise direction.Upon movement of the switch control arm 290 in the opposite direction byactuation of the push button 262 as explained above, the switch 276 ismoved to its other closed position shown in dotted lines in Fig. 23. Theswitch 276 may be of standard construction and the details need not bedescribed herein.

1 The extension 294 on the arm 86 (Figs. 7 and 17 to 22, inclusive) maybe a separate piece secured to the arm 86 or an extension integraltherewith. This extension includes a main portion 296 extendingdownwardly and arcuately about the axis of the stud 92 on which the arm86 is pivoted. Mounted on the lower end of the main portion 296 is anarm 298, arranged for swinging movement on a pivot element 300 such as apin fixed on the lower end of the portion 296. This arm as shown in Fig.7 is arcuate, following the curvature of the main portion 296 itself,and as shown in Fig. 17 is made up of an outer element 302 and an innerelement 304. The outer element 302 is provided with inwardly extendingstuds 306 on which the inner element 304 is mounted. The inner element304 is shorter than the outer element and disposed adjacent the upper orswinging end of the latter and has at its upper end a camming surface308 facing generally inwardly toward the main portion 296,

and a downwardly facing and surface 309 disposed for engaging the pin292.

The arm 298 is biased to a normal position (clockwise, Fig 7) by atension spring 310 anchored between the arm and a fixed pin on the mainportion 296. A stop pm 312 is mounted on the main portion 296 and isengaged by the arm 298 for limiting movement of the latter in clockwisedirection or to its normal position as moved by the spring 310.

The pin 292 on the lever arm 278 extends laterally into engagingrelation with the arm extension 294; as seen most clearly in Fig. 17 itextends laterally beyond the main portion 296 which may be plate-like inshape. It then extends toward the arm 298, beyond the inner element 304but short of the outer element 302. When the arm 86 is in its uppermostposition (i.e., when the feed device 72 is in its uppermost position),the inner element 304 clears or moves upwardly beyond the pin 292 andthe latter is enabled to move under the element 304, the element of themain portion 296 serving as a stop for the pin 292, the lever arm beingbiased in that direction by the spring 286. The pin 292 in such positionunder the lower end edge 309 of the element 304 thus serves as the meansfor normally retaining the arm 86, and thereby the feed device 72 in itsuppermost position, except in single-cycling operation, as explainedbelow. Upon release of the pin from such holding position, the feeddevice 72 is enabled to lower, and this is in consequence of theoperation of starting the machine which is done by depression of thepush button 262 which in turn rotates the starter arm or control lever260 in clockwise direction for moving the pin 292 from under the element304.

A conidtion such as that just described in connection with starting themachine is represented in Fig. 19 where the starter arm 260 is shown inposition as rotated in clockwise direction pursuant to depression of thepush button 262. In such position, the pin 292 is removed from below theelement 304. The feed device 72 is then enabled to drop or lower, andthe limit of its low ering movement is determined, in normal operation,by the thickness of the stack of copy sheets 20 on the tray 22 (Fig. 1).The machine continues normal operation until the copy sheets are allremoved from the tray and is shut off under the control exercised by thefeed device 72 pursuant to its movement to its lowermost position. Thisposition is that in which the feed wheels 74 enter into the depressions82 (Fig. 6) as explained above. Fig. 20 illustrates thecondition at anintermediate point, for example when the stack of copy sheets isapproximately half depleted. The lowering movement of the feed device 72and consequent lowering movement of the arm 86 and extension 294 (Fig.7) continues to the position represented at Fig. 21 in which the arm 298has passed the pin 292, and the pin 292 is thereby disposed above thearm 298. The starter arm 260 is then free to be moved incounterclockwise direction by the spring 286, and upon such movement,the pin 292 enters into a recess 314 above the arm, and engages the mainportion 296 which serves as a limit stop for the pin and consequently ofthe starter arm as mentioned above. When this position is reached, themachine is stopped as explained hereinbelow, and in order to conditionthe machine for further normal operation the feed device 72 and hencearm 86 (Fig. 7) is raised. This is done merely by grasping the rod 90(Fig. 5) and lifting it. This operation causes relative verticalmovement between the extension 294 and the pin 292, as it will beunderstood the latter is fixed against vertical movement. This relativemovement brings the camming surface 308 on the arm element 304 intoengagement with the pin 292 and earns the arm 298 outwardly(counterclockwise, Fig. 22) and enables the arm 84 to be raised. Afterthe latter is raised a suflicient extent, the arm 298 is swung inwardly(clockwise) until it reaches its home position int engagement with. the:pin 312, andsin this position the pin" 292 is disposedv under the lowerend; 309 of the: inner element 334 of the arm; as explained above; Thispin, then serves to retain the feed: device 72in its raised positionuntil the machineisagain started in operation by depression of the pushbutton 62; The pivoted arm 298 enables raisingthe feed device 72-without actuating the starting bar 262 and consequent recycling themachine. 7

The phase just preceding describes control of the stopping. operationwith particular reference to the matter of sensing the copy sheetson"thetray and the last ofthernl'eaving thetrayand being: fed into themachine. Attention is next directed to that phase of the machine anditsoperation whereby the machine is automatically stopped after the last"copy sheet has passed entirely thorugh the machine. 'Itwillbeappreciated that after the last copy sheet has left the tray, themachine. should not b'estopped until that lcopysheet has passed entirelythrough the machine. For this purpose thedrum which carries themasterfor imprintingonthe copy sheets, ,or drive means closelyassociated with the drum, is utilized: for completing. the automaticstopping operation, and therefore, a dual control is exerciseby the feedmeans 72 and drum 36. Attention is now directed particularly to Figs. 8and 13 to 16, inclusive. 9

Figs. 1-3 and 16 shows certain linkage indicated in its entirety at 316generally isolated from the surrounding structure. This'linkage also isshown in Fig. 8 in its relation to the other adjacent operating parts ofthe machine, and is mounted onthe left-hand. side plate 30 on the outerside thereof and covered bythe respective side casing member in. thecompletely assembled ma.- chine. Thislinkage extends substantiallywacross the side plate from front to rear and has elements for sensingthe drum and elements engagingly, related to the feed means 72.

Referring to the individual elementsmak ing. up the linkage, theyinclude acentral arm or link 31'8 pivoted at 320 on theside plate 30 andhaving. arms 322i and 324 bent at an angle to each other toform a bellcrank lever. Forwardly of the; link 318'is an arm or link 32 8' pivotedintermediate its ends on the side plate 30' by suitable meanssuch as astud 330. The arm or. link 328 is pivoted at 332 at one end to the arm324 andat its other end at 334 to a star arm 336. I The star arm 336 ispivoted-on a stud 338' on the side plate 30 and has a dependingextensionor armportion 340 disposed for actuation of a cut-off switch 342. Theswitch342 is a standard switch, and preferably is a microswitch similarto the switches 180 and 276. This switch has a normal self-biasedposition shown in full lines in Fig. 23, and a second closedpositionshown in dotted lines in Fig. 23 to which it is moved by thestar'arm'336; The two positions of the star arm 336 are shown-in fulland dot-dash lines, respectively, in Figs. 13 to 16; In the full lineposition of the star arm ,the switch controlarm 344 is in raisedposition and the switch is then in' the full line position representedin Fig. 23. When the" star arm- 336 .is moved to the dot-dash lineposition, the switch control arm 344 is depressed and the-switehis movedto the dotted line position of Fig. 23.

Forwardly of the star arm 336 andcoop'erating'therewith is a linkagecontrol arm 346 secured toor' formed as an'integral extension of the arm88 (Fig. 8) which supports one end of the shaft 84and bar 90 of the feedmeans 72. This control arm 346 is raised and lowered in the'raising andlowering movements of the'feed'means 72: It. is rigid with the arm 88and arcuate aboutthe axis of the-stud94 on which the arm 88 is pivoted.The arm 346is provided with a camming or working surface 348 having acentral high portion 350 and a low portion 352 atits lowerextendedend,as well as a low portion 354 at its upper end. The star arm 336 includesan extension or arm portion 356 provided with a roller 358 engageablewith and riding on the cam'ining surface 348;

14 The roller: engages the various portions 350; 352,-. and 354 of thearm depending; upon the: position ofa'the ar 'r'n vertically, in' theoperation of the machine as brought out in detail hereinbelow. At thispoint it may be stated briefly that when the roller 358 engages theportion 350, the star am 336 is in a position approximating thedotdashline position (Fig. 13) while,- on the other hand, when it engageseither the portion 352 or 354, the star arnr 336 assumes its full lineposition;

Connected with the opposite or rear end' of the link of lever 318 is astop yoke 360-having a relatively straight shank portion 362 with arms364 and 366' branching off in' the shape of a Y at one end of the shankportion. At the-end of the shank portion opposite the arms is a slot 368slidably receiving a pinon an arm 372. The arm 364 is provided with apin374 which extends through a slot 376 in the sideplate 30, and thearm 366has a pin 378 extendingthrough a slot 380 in the side plate. The yoke360" is pivotally connected to the arm 322 of the link 318 as by apin382. The yoke 360 is supported entirely by its two connections with thelink 318 and arm 372', being free of mounting on the side plate 30.

The arm 372 is in the form of a bell crank lever, pivoted on a pin384secured on the side plate 30. The bell crank lever 372 has two arms,386 and 388, theformer having the pin 370, above referred to, at itsextended end, and the latter having a pin 390 forming the means forpivotal connection between the-arm 388 and another link 392. The latterlink is pivoted at its opposite end on a pin394 ona bell crank lever396, the other end of which is pivoted on a pin 398 on a slide 400. Theslide"400 is mounted directly on the side plate 36 by means of studs 402mounted on thesidepl-ate' and riding in slots 404 in the slide. Theslide includes an angle portion having a downturned flange 406 in whichthe slots 404 are formed and a top horizontal flange 498 on which ismounted a button 410'exposed through the side casing member, as shownclearly in Figs. 1, 2, and 3. This slide 400 has sliding movements onthe pins 402 between the extreme positions shown in Figs. 13 and 16,respectively, for setting the machine for stopping the drum at either oftwo diiferent positions described in detail hereinbelow, and referred toas an 11 inch. and a 14 inch position; The bell crank lever 396 ispivotally mounted on a stud 412 secured to the side plate 30, and isoperative, in response to sliding movements of the slide 400, foractuating the remainder of the linkage.

For the purpose of performing a tripping operation in the actuation ofthe linkage 316, the drum 36 is provided with a carnming or trip element414' arranged for engaging one or the other ofthe pins 374, 378, incertain predetermined positions of the drum and phases of operation of themachine for effecting stopping of the machine. The element 414 may bemounted on the end surface of the drum (Fig. 4) and the pins 374, 378extend through the side plate so as to be positioned for engagement'bythe trip element. The orbit of the outermost point of the camming ortrip element 414 is indicated by the circle 416, and this elementengages either the pin 374 or-378 depending on which is disposed withinthe orbit, it being possible for only one of the pins to be so disposed,the positioning of the'pinsbeing mutually exclusive. The positioning ofthese pins is accomplished by the slide 400, and assuming a firstposition such as shown in Fig. 13, the linkage is disposed with the pin374 in that orbit. The shifting or changing of position is accomplishedby shifting the yoke 360 which is accomplished by sliding the slide 400to the opposite position, or that shown in Fig. 16. This slidingmovement rocks the bell crank lever 396 in counterclockwise direction,and this bell crank lever acting through the link 392 rotates the arm orbell crank lever 372 also in counterclockwise direction. Rotation-of thelatter, actingth'rough the pin 370, rotates the yoke 360 15 incounterclockwise direction about the axis of the pin 382 carried by thelink 318. This rotation or rocking of the yoke 360 removes the pin 374from the orbit 416 and moves the pin 378 into the orbit. I

For the purpose of following through the operating movements of thelinkage 316, a single position of the yoke 360 is assumed, namely, thatshown in Fig. 13. In this position of the slide 400 and related elementsof the linkage, the pin 374 is in position to be engaged by the cammingor trip element 414 on the drum. Assuming operation of the machine andconsequent rotation of the drum 36, when the drum rotates(counterclockwise) to the position approaching that in Fig. 13, thecamming or trip element 414 approaches the pin 374. Continued rotationof the drum causes the element to engage the pin 374 and the latternormally is within the orbit of the outer extremity of the camming ortrip element, and the latter, having a curved camming surface for thepurpose, cams the pin 374 outwardly. The yoke 360 is held againstswinging movement by the two point connection at the pins 382 and 370,and the effect of the camming action of the element 414 on the pin 374is to move the yoke 360 translationally outwardly, i.e., in radialdirection. This movement is indicated by the dotted line positionillustrated in Fig. 13. The yoke 360 slides relative to the pin 370, andthe connection at the pin 382 between the yoke and the bell crank lever318 causes the latter to be rocked or rotated in counterclockwisedirection, also to the dot-dash line indicated. This rotation of thebell crank lever 318 in counterclockwise direction rotates the link orlever 328 in clockwise direction, and the latter rotates the start arm336 in counterclockwise direction, in each instance the respectivemember being moved from the full line position to the dot-dash lineposition. The actuation of the linkage in the manner just describedpresupposes the position of the linkage control arm 346 in either itsuppermost position of Figs. 13 and 14, or its lowermost position asshown in Fig. 15. Assuming first the uppermost position of the arm asshown in Figs. 13 and 14, the roller 358 on the star arm is in registerwith the low point 352 on the arm, enabling the star arm and the otherelements of the linkage to assume their full line position. In this fullline position, the pin 374 is within the orbit of the trip element 414.The action of tripping the pin 374 rotates the various elements of thelinkage in the manner mentioned, in which the roller 358 is lifted fromthe control arm 346. After the tripping operation, the linkage returnsto its full line position in which the roller 358 again engages thecontrol arm at the low point 352. A similar situation exists in the casewhere the arm 346 1s in its lowermost position, as shown in Fig. 15, thelow point 354 being essentially in the same are with the low point 352.The roller 358 thus engages and is lifted off of the low point 354 inprecisely the manner described in connection with the low point 352. Theactuation of the linkage in either case causes the switch 342 to beactuated, through the medium of the control arm 344, and causes stoppingof the machine as will be explained in detail hereinbelow, the actionbeing directly related to the then assumed position of certain otheroperating elements of the machine.

During the normal operation of the machine between the startingoperation and the stopping operation, it is deslred that the linkage 316and the switch 346 not be constantly actuated in each rotation of thedrum, and for this purpose the control arm 346 is provided, the armacting through the high portion 350 for this purpose. In the normaloperation of the machine and when the feed means 72 is lowered from itsuppermost position, as explained above, the linkage control arm 346 islowered a corresponding amount. This brings the high point 350 intoregister with the roller 358 on the star arm 336. The throw between thelow point and the high point is such that the linkage is moved from thefull line position to the dot-dash line position, and preferablyslightly more, which action withdraws the pin 374 out of the orbit ofthe trip element 414. This arrangement retains the linkage ininoperative position so that during the operation of the machine the pin374 is not tripped at each revolution of the drum, as would be the casewere it not for the high point 350. When the stack of copy sheets fromthe tray 22 is depleted, and the feed means 72 is lowered to itslowermost extent, the arm 346 is also lowered to its lowermost positionwhich places the low point 354 in register with the roller 356 on thestar arm 336. This enables the linkage to assume its full line positionwith the pin 374 in the orbit of the element 414, and the latter in itsnormal revolution on the drum engages the pin and trips the linkagewhich in turn actuates the switch and shuts off the machine inconjunction with other elements according to the setting of the latter.

The tripping of the linkage by the element 414 is accomplished at apredetermined point in the rotation of the drum, as will be understood.The setting illustrated in Fig. 13 is for example a 14 inch setting toaccommodate copy sheets of 14" length, which is one of two popularlengths commonly used in duplicating machines, the other being 11". The11 inch setting is illustrated in Fig. 16 where the pin 378 isillustrated as being within the orbit of the trip element 414, asexplained above. In the setting of the linkage, as illustrated in Fig.16, the linkage is actuated and the switch 342 is actuated in accordancewith the position of the pin 378 relative to the angular position of thedrum. This position is angularly offset with respect to the pin 374 and,consequently, the machine is stopped at a different position in therotation of the drum. More specifically, when the setting is as shown inFig. 13, or a 14" setting, the drum is stopped in the position shown inFigs. 4 and 6, with the clamp bar 38 disposed adjacent the top, asindicated in full lines. On the other hand, with the setting asrepresented in Fig. 16, or an 11" setting, the machine stops with thedrum positioned with the clamp bar as indicated in dot-dash lines inFig. 6.

In either case the machine is brought to a stop according to the controlestablished by the drum and in this way it is not stopped until the lastcopy sheet leaving the tray 22 passes entirely through the machine andleaves the drum after an imprinting or duplicating operation. Furtherreference to this feature is made hereinbelow.

The invention also includes a modified control arrangement for stoppingthe machine pursuant to a copy sheet passing entirely through themachine. This modified arrangement finds particular utility in view ofthe raise and lower feature referred to above. The raise and lowerfeature has to do with positioning the imprinted material on the copysheet at relatively higher or lower positions thereon. This control isexercised by adjusting the drum angularly relative to the shaft on whichit is mounted. The means for feeding the copy sheets through the machineis driven by the shaft on which the drum is mounted, e.g., by means ofthe gear 142 which is mounted on the disc assembly 138, 140. If the drumis adjusted angularly relative to the shaft a great amount, a positionmay be reached in which a copy sheet of 14" length may not be movedentirely past the drum at the time the machine is stopped pursuant totripping the stop means by the 14" setting of the stop yoke 360. Thisphenomenon is due to the fact that the copy sheets are driven throughthe machine by a drive means which can assume diflerent rotationalpositions relative to the drum.

In order to overcome such a situation the modification of Fig. 16A maybe utilized. The construction illustrated in this figure includes theside plate 30, discs 138 and 140, gear 142 and stop yoke 360, all in theconstruction described above. The present construction also includes thepin 378 on the stop yoke 360 which projects through 17 the slot 376 inthe side plate 30. The pin 378 that utilized in the 11 inch,setting.

The present modified construction includes a trip arm 415 mounted on thestop yoke 360 by suitable means such as by welding. This trip armextends into the space between the discs 138 and 140 in position to betripped by a trip element 417 secured to one of the discs, such as 140.The length and direction of the arm 415 are such, relative to the pin378, as to serve for the.14"-trip operation. The trip element 417 is sodisposed on the disc 140 that when the stop yoke 360 is moved to the 14setting, the element 417 engages the arm 415 and trips the linkage 316(Figs. .13 and 16) after a 14 copy sheets passes entirely through themachine and past the drum regardless of the raise and lower setting ofthe drum. The trip element 417 being secured to the disc 140 trips thearm 415 at a predetermined position of the feed means for feeding thecopy sheet, and is not affected by the setting of the drum relative tothe drive means. In the present instance, the stop yoke 360 does nothave an 11" trip element (such as the pin 374).

Provision is made for single cycling of the machine, i.e., the machinewill operate through one cycle in response to its being turned on andwill then automatically be shut off. The use of the machine in suchmanner will find particular use in connection with so-called systernswork, in which the copy sheets, because of the nature of the work, arefed through the machine manually. In such case the machine is turned onand it operates through one cycle, during which one copy sheet ismanually fed to and passes through the machine. This single cyclingcontrol is effected through the medium of the feed means 72 andattention is directed particularly to Figs. 8 and 8A. It will berecalled that in the normal operationof the machine in which it is tocycle repeatedly, the feed means 72 is lowered into engagement with thestack of copy sheets. In the single cycling operation, the feed device72 is retained in raised position by means of a latch device indicatedin its entirety at 416, which is utilized for latching the arm 88 inraised position. This latching device 416 includes an arm 418 (see alsoFig. 4) having angle arm portions, one of which 429, is pivoted on theside plate 2t) as at 422 by means of a pin mounted on the side plate,and the other, 424, on which is mounted a push button 426 exposedthrough the adjacent side casing member as shown in Figs. 1 and 3. Thislatching arm 418 is an over-center device having a slot 42.8.receiving apin 430 mounted on the side plate 30 and serving as a limit stop in bothdirections of angular movement of the plate. A tension spring 432 isanchored between the upper swinging end of the arm 418 and a pin 434 onthe side plate 30. Upon swinging movement in clockwise direction (Figs.8 and 8A) in response to manipulation of the push button 426, a toe 435on the lower end of the arm engages under a shoulder 436 on the arm 346.In such position of the latching means the arm 88 and thus the feedmeans 72 is retained in raised position, and in such position themachine operates through only a single cycle after which itautomatically shuts off, as explained more fully hereinbelow. When theoperator wishes the machine to operate continuously he throws thelatching means 416 in the opposite direction, namely, to the positionshown in Fig. 8, in response to which the toe 434 is removed from theshoulder 436 and the arm 88 and consequently the feed means 72 is per- Imitted to lower pursuant to other manipulation during operation of themachine as described below. The latching device 416 is releasablyretained in either of its two extreme positions by means of the spring432.

Reference may now be made to the manner of operation of the machine innormal use. For this purpose assume aposition of rest in which themachinenormally is disposed between periods of operation. Inwsuchpositiontthe push button 262 is biased outwardly (to the left in Figs. 1and 7). In this position also the brake 195 in Figs. 9 and 12 is held inbraking position by the latch arm 228. The switch (Fig. 5) is latched inopen position (Fig. 23) by the latch member 230 (Fig. 9).- The switch342 on the left-hand side of the machine (Fig. 8) is in the full lineposition of Fig. 23. The switch 276 on the right-hand side of themachine (Fig. 7) is in the full line position of Fig. 23. The feeddevice 72 is in raised position (Fig. 3) being held in such position bythe pin 222 (Fig. 18). Also, the single cycling latch means of Figs. 8and 8A is in a position shown in Fig. 8, i.e., non-latching position.

With the machine set according to the foregoing, the operator .places astack of copy sheets 20 on the tray 22 (Fig. l) and aligns them inproper position. Assume that the copy sheets so placed in the machineare of 11" length. The operator then moves the slide 400 to the 11"position (Fig. 16) if it was not at that time in such. position. Theoperator then depresses the push button 262 (Fig. l) which will rock thestarter arm (Fig. 7) in clockwise direction. This movement of the arm260 performs several functions, as follows: through the medium of thebar 254 (Figs. 5 and 9) the latch members 228, 230, are moved tounlatching position. One of the latch members, 228, on being unlatched,releases the brake (Figs. 9 and 12) from braking position. The other ofthe latch members, 230, on being unlatched, releases the switch controlarm 182 on the switch 180 (Fig. 5) and the switch moves to the full lineposition of Fig. 23. V 304, and the feed means 72 is permitted to drop,with the feed wheels 7-4- dropping into engagement with the copy sheets.The movement of the starter arm or control lever 26%), in the mannermentioned, furthermore actuates the switch control lever 290 (Fig. 7)and actuates the switch 276 to the dotted line position of Fig. 23. Inthis connection attention is directed to Fig. 23 which shows certainmechanical elements in purely diagrammatic arrangement to show theirassociation and function in the control of the circuit. These mechanicalelements include the starter arm 260 which, when actuated, through themedium of the pin 288, moves the switch 276 to the dotted line position,and through the medium of the bar 254 releases the latch members 228 and230.

Pursuant to the foregoing manipulations, namely, depression of the pushbutton 262, the machine is placed in operation according to thefollowing. Referring to Fig. 23, a current source is indicated at 433,from which cur:- rent passes through conductor 44th, switch 276 which atthis time is in the dotted line position, through the conductors 441 and448, and then to the motor 102 and through the conductor 450, completingthe circuit. The motor is thus placed in operation and the machine isoperated in the usual manner. The .drum 36 is rotated through the driveshown in Fig. 7, namely, pulley 118, belt 120, pulley 122, pulley 126,belt 123., and pulley 13% which is secured to the drum shaft 132.Thereupon the rotation of the drum and the drive to the moistening roll42 (Fig. 6), feed wheels 74 and impression roll 40, are precisely asdescribed in the second of the two abovementioned co-pendingapplications.

The operation of the machine continues as just referred to until thelast of the copy sheets 29 is removed from the tray 22. The copy sheetsare remcvedfrom the tray by the action of the feed wheels .74, thesewheels and the feed means 72 on which the wheels are mountedconstituting a device for sensing the copy sheets on the tray forautomatically shutting ofi the machine when the sheets are depleted. Asmentioned above, this, action is accomplished pursuant to the wheels 74falling into depressions 82 (Fig. 6). When this happens, two thingsoccur which condition the circuit of Fig. 23 so that the machine will beautomatically shut off at the The pin 292 is removed from the elementspasms end of a cycle as determined by the rotation of the drum 36. Thefirst occurrence is that the starter arm 260 is returned to its initialposition, i.e., the position shown in Fig. 21 which is equivalent tothat of Fig. 7. In explanation, it will be recalled that on depressionof the push button, the starter arm (Fig. 19) was removed from under theelement 304, whereupon the arm 86 with the elements 296 and 302 mountedthereon moved downwardly. The pin 292 then engaged against the outerperipheral edge of the element 304 and the latter retained the starterarm in its actuated or depressed position, i.e., the position of Fig.19, with the switch 276 in the dotted line position of Fig. 23, untilthe arm 86 reaches its lowermost position pursuant to depletion of thecopy sheets, whereupon the pin 292 is enabled to enter into recess 314(Fig. 21) pursuant to which the starter arm 260 moved incounterclockwise direction to its initial position. In the lattermovement, the switch control arm 290 (Fig. 7) was released and theswitch 276 assumes the full line position of Fig. 23.

The second occurrence in response to the feed means .72 reaching itslowermost position is related to the control means and linkageillustrated in Figs. 13 to 16. When the control arm 346 reaches itslowermost position pursuant to the feed device 72 reaching thatposition, the roller 356 on the star arm 336 is permitted to drop intothe low point or notch 354 as represented by the full line positionillustrated most clearly in Fig. 15. This enables the linkage to assumeits full line position at all points from the roller 358 to the forkedend of the yoke 360. This position places the pin 374 within the orbitof the trip element 414. When the latter engages the pin 374 pursuant tocompletion of the respective revolution of the drum, it trips the pin374 and consequently actuates the linkage, moving the star arm to itsdot-dash line position, and the latter depressing the switch control arm344 on the switch 342. The latter actuation moves the switch from thefull line position to the dotted line position of Fig. 23.

' The movement of the two switches, namely, 276 and 342, at the timesand under circumstances referred to, automatically stops the machine.The condition of the circuit of Fig. 23 under such condition is asfollows: the switch 276 is in the full line position (Fig. 23); and thecircuit leads from the source 438 through the conductor 440, switch 276,conductor 442, switch 180, conductor 444, and with the switch 342 in itsdotted line position as so actuated by the linkage 316 as justdescribed, the current continues through that switch and conductor 452to solenoid 214 referred to above and shown in Fig. 23; the circuit iscompleted through conductor 454 and conductor 450 to the source 438.Upon energization of the solenoid 214 the switch 180 is moved to itsdotted line position and the brake 196 is applied, as described above.The latch means 228 and 230 then become effective for latching theswitch and brake in the positions to which they were just moved. It willbe understood that the movement of the switch 276 from the dotted lineposition to the full line position of Fig. 23

in the shutting off operation only momentarily breaks the circuit to themotor, and as a practical matter the motor continues running.

It will be realized that the solenoid 214 remains energized onlymomentarily because upon energization of the solenoid the switch 180 isopened and the current to the solenoid is cut ofi. Thus, when the switchis opened, the solenoid becomes tie-energized, but the switch is latchedin its open position and the brake is latched in braking position by thelatch means 228 and 230, which constitute mechanical means for thepurpose. Thus is provided a means for electrically actuating the switchand brake but utilizing a mechanical means for retaining them in theiractuated position, enabling the electrical means, or solenoid, to beimmediately de-energized.

It will be appreciated that the star arm 336 (Figs. 13' and 23) isactuated also only momentarily so that the switch 342 is moved to itsdotted line position (Fig. 23) only momentarily and it immediatelyreturns to the full line position, whereupon the circuit can be readilyconditioned for operation (from switch 276 and through conductors 441and 448) in response to depression of the push button 262.

The purpose of moving the linkage 316 (Figs. 13 to 16) to the dottedline position by means of the arm 346 is to eliminate repeated actuationof the linkage before it is intended that the machine be brought to astop. It will be understood that actuation of the switch 342 in anintermediate position of the arm 346 would not shut oif the machinesince the switch 276 remains in the dotted line position of Fig. 23, andmovement of the switch 342 with the circuit in such condition, would beidle movement. Hence, the means for presenting repeated and needlessactuation of the linkage 316.

Upon shutting off the machine pursuant to depletion of the copy sheets,as just described, the machine remains at rest with the feed means 72 inits lower position. To condition the machine for further use, theoperator grasps the bar 30 (Figs. 1, 3, and 5) and raises it. It isnormally retained in such position by the pin 292.

Whenever the operator wishes, if it should be desired, to shut ofi themachine manually and before it would shut off automatically, he merelyraises the feed means 72 from the stack of copy sheets to its uppermostposition. This operation conditions the machine the same as if itreaches its lowermost position-the pin 25 2 is enabled to pass under theelement 304, releasing the starter arm and enabling the switch 276 toassume the full line position of Fig. 23; and the low point 352 on thearm 346 registers with the roller 358, enabling the pin 274 to beprojected into the orbit of the trip element 414.

In the single cycle operation of the device, the push button 426 (Figs.8 and 8A) is pushed downwardly to the position shown in Fig. 3. Thismovement rocks the arm 418 to move the toe-434 under the shoulder 436and this retains the feed means 72 in raised position. Thereupon in anoperation of the machine the push button 262 is depressed. This sets upthe circuit as described in connection with the operation of the machineabove, but the condition is maintained only through one cycle ofoperation, i.c., one revolution of the drum. When the feed device 72 isretained in its raised position by the latch means of Fig. 8A, and whenthe control button or push button 262 is depressed, the pin 292 (Fig.19.) while it is removed from under the lower end 309 of the element304, the arm 86 is retained in upper position and when the push button262 is released the pin 292 is then enabled to move under the element304 and the starter arm 262 to assume its normal position, namely, thatof Figs. 7 and 18. Upon depression of the push button 262 and rocking ofthe lever 260, the pin 288 (Figs. 7 and 23) moves the switch 276 to thedotted. line position of Fig. 23. The circuit is then conditioned asdescribed above in the beginning of the operation, namely, current fromthe source 438 passes through the conductor 440, the switch 276,conductor 441, conductor 448, the motor 102 and returns through theconductor 450 to the source. However, the button is depressed onlymomentarily and released and when it is released, the switch 276 movesto the full line position of Fig. 23 and the circuit through the motoris then from the source 438, conductor 440, switch 276, conductor 442,switch which is closed, conductor 444, switch 342 which is in the fullline position, conductor 446, conductor 448, motor 162 and conductor450, and in return to the source. The circuit then remains conditionedas shown in full lines in Fig. 23. Upon completion or" a single cycle,namely, a single revolution of the drum, the trip element 414 engagesthe pin 374 and actuates the linkage which in turn actuates the star arm336 and moves the switch 342 to the dotted line position of Fig. 23. Themachine is then automatically shut ed and braked in the manner describedabove in connection with the automatic shut-off when the pin 292 isenabled to drop into the recess 314 as shown in Fig. 21. In each casethe switch 276 is in that condition shown in full lines in Big. 23. Itwill be recalled from the description above that the low point 352 atthe lower end of the arm 346, as shown most clearly in Fig. 14, enablesthe linkage to assume its full line position. This position of thelinkage enables the pin 374 to fall within the orbit of the trip element414.

The diameter of the drum 36 is such as to accommodate a master, and copysheets, of a certain predetermined maximum length in accordance withpopular demands in connection with duplicating machines. For example,duplicating operations are performed quite often on sheets of fourteeninch length. Although it is desired to accom modate copy sheets of suchlength, the majority of duplicating work is done on shorter sheets,namely, eleven inch sheets. It is highly desirable that a single machinebe capable of accommodating duplicating processes in connection withboth of these sizes of sheets with greatest and maximum convenience tothe operator. The automatic shut-ofi and braking operation are initiatedby means which senses the copy sheets, but it is desirable that the lastcopy sheet be permitted to pass entirely through the machine before themachine is entirely shut otf. The drum rotates once during each cycleand it is desired that the means for clamping the master, namely, theclamp bar 38 (Fig. 6) be positioned for easy access when the machinecomes to rest. This is preferably adjacent the top as shown in Fig. 6 sothat the operator can have easy access thereto with a minimum ofhindrance fromother portions of the machine, such as the tank 56. Forthis reason the machine is set at an eleven inch position when eleveninch copy sheets are being used. The pin 374 (Fig. 13) is positioned atsuch angular position of the drum that when the trip element 414 engagesthe pin, when the pin is in operative position, the machine is broughtto a stop with the clam-ping bar 38 adjacent the top. At this positionthe copy sheet being imprinted upon in that cycle will have passedentirely through the machine and left the drum and moved onto the tray24 at the rear of the machine.

On the other hand, when fourteen inch sheets are being used, it isdesired that a cycle of operation of the machine be such that the copysheet being imprinted upon in that particular cycle be passed entirelythrough the machine, but in order for this to be accomplished, it isnecessary for the drum to be rotated a greater amount, or to a positionrepresented approximately by the dotdash line position of the clampingbar 38 in'Fig. 6. Such position of the drum represents a greater portionof a revolution of the drum, and such as to enable the fourteen inchsheet to entirely move past the drum. However, to change a fourteen inchmaster on the drum would entail considerable difficulty with the clampbar 38 positioned as shown in dot-dash lines in Fig. 6. When it isdesired to so change a fourteen inch master, the operator pushes down onthe button 266 '(Figs. 1 and 3) which unlatches the latch member 228(Figs. 5 and 9) and releases the brake, whereupon the operator isenabled to rotate the drum by grasping the hand wheel 134. The operatorthen rotates the drum to position the clamp bar 38 adjacent the top asindicated in full lines at 6. 'lhus means is provided for automaticallybraking the machine in the stopping operation, but convenient means isprovided for releasing the brake without putting any of the otheroperating functions into elfect, to enable the machine to be manuallyrotated. -In the useof fourteen inch sheets, the slide 400 is moved tothe fourteen inch position, as described above.

It is thought that the invention and manyxof its attendant advantageswill be understood from the foregoing description, and it willbeappa-rent that various :changesmay be made inthe form, constructionand ar- '22 rangement of the parts without departing from thespirit' andscope of the invention or sacrificing ,all of its material advantages,the form hereinbefore described being merely a preferred embodimentthereof.

I claim:

1. A duplicating machine comprising a support for copy sheets, arotatable drum for carrying a master for imprinting on the copy sheets,means for feeding copy sheets successively from the support through themachine, means including an electric motor for driving the feeding meansand drum through a succession of cycles, the drum making one revolutionin a cycle, circuit means for controlling the electric motor, a gravityoperated fol- Lower arranged for riding on a stack of the copy sheets onthe support, and means for automatically stopping the machine includingswitch means in said circuit means and a manually actuated controlmember for operating said switch means, the follower and control memberhaving cooperating interengagement whereby in either the uppermost orlowermost position of the follower the control member assumes aretracted position, and when the follower is in its uppermost positionand the control member is in its retracted position the control memberretains the follower in uppermost position, said switch means having aself-biased position when the control member is in retracted position inwhich it de-energizes the circuit for stopping the motor.

2. A duplicating machine comprising a support for copy sheets, arotatable drum for carrying a master for imprinting on the copy sheets,means for feeding copy sheets successively from the support through themachine, means including an electric motor for driving the feeding meansand drum through a succession of cycles, thedrurn making one revolutionin a cycle, circuit means for controlling the electric motor, switchmeans having a first and a second position for controlling the circuitmeans, a manually actuated control member having a retracted positionand an advanced position in which the switch means is in said secondposition, a gravity actuated follower engageable with copy sheets on thesupport, the follower being arranged for controlling the control memherand enabling the latter to assume its said retracted position when thefollower is in either uppermost or lowermost position, manually actuatedmeans for releasably retaining the follower in uppermost position, andmeans controlled by the drum effective for stopping'the machine when theswitch means is in its said first position.

3. A duplicating machine comprising a support for'copy sheets, arotatable drum for carrying a master for imprinting on the copy sheets,means for feeding copy sheets from the support to the drum and throughthe machine, a motor for driving the drum and feeding means, drive meansincluding speed reducing means between the motor and drum for drivingthe latter and related parts, the drive means including a high speedelement between the motor and speed reducing means of a diameter greatlyless than that of the drum and rotatable at a speed greatly in excess ofthat of the drum, means for shutting ofi the motor, means for brakingthe drive means including a brake shoe engageable with said high speedelement of the drive means, and control means for controlling theshutting off and braking means.

4. A duplicating machine comprising a support for copy sheets, arotatable drum for carrying a master for imprinting on the copy sheets,means for feeding copy sheets from the support to the drum and throughthe machine, a motor driving the drum and feeding means, means forstopping the machine in response to the last of the copy sheets leavingthe support and passing through the machine including means for shuttingoff the motor and means for braking the moving parts, said shutting oifmeans and braking means being movable into and out of an operativeposition, first latch means for retaining the shutting off means inoperative position, second latch :nacans ;for;retai;ning the brakingmeans inoperative

